CN1540906A - Multiple wavelength ultra continuous light sources - Google Patents
Multiple wavelength ultra continuous light sources Download PDFInfo
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- CN1540906A CN1540906A CNA2003101083037A CN200310108303A CN1540906A CN 1540906 A CN1540906 A CN 1540906A CN A2003101083037 A CNA2003101083037 A CN A2003101083037A CN 200310108303 A CN200310108303 A CN 200310108303A CN 1540906 A CN1540906 A CN 1540906A
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Abstract
The multiple wavelength ultra continuous light source of dense wavelength division multiplexing belongs to optical communication area. Two fiber-coupler forms loop type cavity. Continuous light output from semiconductor laser through connection of 50:50 fiber coupler is input to phase modulator. Connection sequence is as following: from radio frequency microwave source to phase modulator, dispersed fiber, powerful erbium doping amplifier, dispersion displacement optical fiber, 90:10 fiber coupler. 90% output port is connected to another input port of 50:50 fiber couplers. 10% port is connected to one end of erbium doping fiber amplifier, and another end of the erbium doping fiber amplifier is input to demultiplexer. The invention through modulation generates stable shorter light wavelength with lower injected optical power.
Description
Technical field
What the present invention relates to is the transmitting illuminant that a kind of optical communication is used, particularly a kind of multi-wavelength dense wave division multipurpose optical communication light source that produces based on super continuum light in the optical fiber.Belong to the optical communication field.
Background technology
Dense wavelength division multiplexing system uses maximum light sources to be still the distributed feedback type semiconductor laser that different wave length separates at present, semiconductor laser quantity increases synchronously with the number of channel, higher single channel speed is that it and DWDM binding energy make the transmission capacity of system break through too bit with Optical Time Division Multiplexing (OTDM) technology.Characteristics such as it is wide that the multi wave length illuminating source of dense wavelength division multiplexing system should possess spectral region, and channel lines width and channel wavelength are highly stable.Multi-wavelength super continuum light source is simple in structure because of having, the channel cost is low, the advantage of good stability etc., is the most promising light emitting devices of optical communication system of vast capacity of future generation.The super continuum light source exactly is amplitude limit spectrum super continuum light source, when having the short pulse injection fibre of high-peak power, because the nonlinear propagation meeting produces super continuous wide spectrum in optical fiber, it can become many wavelength by amplitude limit, and is suitable for the light source as big capacity dense wavelength division multiplexing system.
Find by literature search, the papers that the people delivered such as T.Morioka " 1Tbit/s (the OTDM/WDM transmission using a single supercontinuum WDMsource. of 100Gbit/s * 10channel) " (using 1Tbit/s (100Gbit/s * 10 channels) the OTDM/WDM transmission of super continuous Wavelength division multiplexed light source) Electron.Lett., Vol.32, p906,1996. (1996 be published in " electronics wall bulletin "), this article have reported that the big capacity OTDM/WDM of 1Tbit/s transmission system used the super continuous Wavelength division multiplexed light source of multi-wavelength.Its method that produces the super continuum light source is to obtain high-speed plus series with active mode locking pulse laser and the excitation of external radio frequency synthesizer as the synchronous of master clock, again through after the light pulse power amplification in dispersion shifted optical fiber (DSF), produce the super continuum light spectrum by comprehensive nonlinear effect, after the multi wave length illuminating source that narrow band filter or demodulation multiplexer output dwdm system are used.The last like this multi wave length illuminating source that obtains only is applicable to the NRZ system, can not be used for vast nonreturn to zero code system, and need to inject big luminous power in optical fiber, generally watt more than the level.
Summary of the invention
The objective of the invention is in order to overcome deficiency of the prior art, a kind of multi-wavelength super continuum light source of dense wavelength division multiplexing system is provided, makes its more stable low noise multi wave length illuminating source, it is low to have a pumping light power, the advantage that the spectrum flatness is good, and be applicable to the nonreturn to zero code system.The present invention the most important thing is to adopt loop feedback, can constantly produce new sideband frequency by modulation, and each optical wavelength of generation is more stable, and fiber lengths can be shorter, and it is lower to inject luminous power.Thereby system cost is effectively reduced.
The present invention is achieved by the following technical solutions, the present invention includes: continuous semiconductor laser, phase modulator and frequency microwave source, dispersive optical fiber, two erbium-doped fiber amplifiers, dispersion shifted optical fiber, a demodulation multiplexer, and each one of the fiber coupler of 50: 50 and 90: 10.Its connected mode is: the continuous light of semiconductor laser output is input to phase modulator through the fiber coupler connection, phase modulator is connected with the frequency microwave source, connect dispersive optical fiber behind the phase modulator, connect powerful erbium-based amplifier behind the dispersive optical fiber, connect dispersion shifted optical fiber thereafter, connect 90: 10 fiber coupler behind the dispersion shifted optical fiber, its 90% delivery outlet is connected with another input port of fiber coupler, 10% port of fiber coupler is another erbium-doped fiber amplifier in succession, erbium-doped fiber amplifier other end input demodulation multiplexer, between each parts be connected to the direct welding of optical fiber or optical patchcord connects.
The continuous semiconductor laser is the continuous semiconductor laser of tunable or fixed wave length.Phase modulator is a lithium niobate electric light phase modulator, perhaps position phase or intensity modulator.The splitting ratio of two fiber couplers is respectively 90: 10 and 50: 50, perhaps selects splitting ratio according to the power output of multi wave length illuminating source.Dispersive optical fiber, dispersion shifted optical fiber are selected length and fiber type according to the output of multi wave length illuminating source.The type of demodulation multiplexer and output wavelength standard are selected according to the wavelength output of multi wave length illuminating source, satisfy the demand of dwdm system.
During work, the continuous light of semiconductor laser output is input to phase modulator through fiber coupler connection in 50: 50, through producing sideband frequency after the modulator high frequency modulated, phase modulator is driven by the frequency microwave source, and its light frequency is the microwave frequency of modulation at interval.Be converted into intensity modulated and carry out pulse compression simultaneously after the optical fiber dispersion transmission.Connect powerful erbium-based amplifier behind the dispersive optical fiber, after luminous power was amplified, dispersion shifted optical fiber was advanced in input again, produced the super continuum light spectrum by nonlinear effect in dispersion shifted optical fiber.Connect 90: 10 fiber coupler behind the dispersion shifted optical fiber, its 90% delivery outlet is connected with another input port of 50: 50 fiber coupler, 90% light of dispersion shifted optical fiber output feeds back the carry phase modulation again, also produces more sideband frequency through the phase modulator modulation.So circulation repeatedly can produce more sideband optical frequency.10% port of 90: 10 fiber couplers is another erbium-doped fiber amplifier in succession, the multi-wavelength light of 10% port output, after the erbium-doped fiber amplifier amplification, the demodulation multiplexer of dense wave division multipurpose is advanced in input, is met the light of each channel wavelength of ITU-T requirement by demodulation multiplexer output.The output wavelength of semiconductor laser is chosen near the negative dispersion zone, zero dispersion point of dispersion shifted optical fiber, utilizes the nonlinear effect based on four wave mixing to realize spectrum widening.
It is generally acknowledged that at the standard dispersion area of dispersion shifted optical fiber mainly by produce super continuous broadening from phase modulated, four-wave mixing effect is difficult to coupling mutually because of the position, the optical frequency conversion efficiency is not high.And light is when the negative dispersion zone of dispersion shifted optical fiber, the position of realizing four wave mixing easily is complementary, therefore the present invention selects near the negative dispersion zone of the wavelength zero dispersion point of dispersion shifted optical fiber of semiconductor laser, utilization produces new plain edge and reaches spectrum widening frequently based on the nonlinear effect of four wave mixing, it can modulate, intersect the position modulation new side frequency of more effective generation and widening mutually mutually than self-alignment.In the present invention, modulate mutually with the position to produce sideband frequency because be, the phasic difference of each side frequency is fixed, the transmission chromatic dispersion can produce the coherent pulse of intensity modulated in optical fiber, but its minute, the light intensity of frequency do not change in time, therefore by separating the continuous multi-wavelength output of the relevant generation in position, the present invention is applicable to the nonreturn to zero code system simultaneously.
The optical frequency that the present invention produces is taken out the decision of light frequency difference by fortune in the four wave mixing at interval, and this difference on the frequency (or frequency interval) is by the modulating frequency decision of modulator.The microwave frequency of 50GHz is modulated in this way, and by the DWDM demodulation multiplexer that channel spacing 50GHz is, can be 16,40 or more multi channel light source with its amplitude limit.The frequency of the wavelength and the modulator of light source laser is depended at each channel wavelength of Chan Shenging and interval at last.Therefore use microwave source and a demodulation multiplexer of a precise frequency, the present invention can provide multi wave length illuminating source for dwdm system.As producing the multi wave length illuminating source of other wavelength interval, can select the microwaves corresponding frequency to modulate, as modulating, can produce the multi wave length illuminating source of the dwdm system that is applicable to 25GHz, 100GHz wavelength interval with microwave frequencies such as 25GHz, 100GHz.
Another marked improvement of the present invention is to use loop feedback, owing to can constantly produce new sideband frequency by modulation, each wavelength frequency of generation is more stable, and the fiber lengths that uses can be shorter, and it is lower to inject luminous power.The live width of each wavelength that produces because of four wave mixing can not produce significant broadening, and frequency stability is better.The luminous power of last each channel uses the wavelength equalizer to carry out equilibrium, or by the flat gain power amplifier its power output is amplified.
The present invention has substantive distinguishing features and marked improvement, compare with traditional super continuum light source, not only consider the amplitude response of light, also system has considered coherence, the position characteristic that is complementary of optical transmission, use loop feedback, can constantly produce new sideband frequency by modulation, each optical wavelength of generation is more stable, use fiber lengths shorter, it is lower to inject luminous power.Frequency interval between each wavelength is by the repetition rate or the modulating frequency decision of light pulse sequence, wavelength stability height.In addition,, can produce the short pulse near transform limit of a plurality of wavelength equally, also be applicable to the OTDM/DWDM system if adopt mode locking pulse to replace the continuous semiconductor laser as the input light source.
Description of drawings
Fig. 1 structural representation of the present invention
Embodiment
As shown in Figure 1, the present invention includes: continuous semiconductor laser 1, phase modulator 2 and frequency microwave source 8, dispersive optical fiber 3, erbium-doped fiber amplifier 4, dispersion shifted optical fiber 5, fiber coupler 7, erbium-doped fiber amplifier 9 and the demodulation multiplexer 10 of 90: 10 fiber couplers 6 and 50: 50.Its connected mode is: the continuous light of semiconductor laser 1 output is input to phase modulator 2 through fiber coupler 7 connections, phase modulator 2 is connected with frequency microwave source 8, phase modulator 2 backs connect dispersive optical fiber 3, dispersive optical fiber 3 backs connect powerful erbium-based amplifier 4, connect dispersion shifted optical fiber 5 thereafter, dispersion shifted optical fiber 5 backs connect 90: 10 fiber coupler 6, its 90% delivery outlet is connected with another input port of fiber coupler 7, fiber coupler 6 and 7 forms ring-like chamber, 10% port of fiber coupler 6 is erbium-doped fiber amplifier 9 in succession, erbium-doped fiber amplifier 9 other ends inputs demodulation multiplexer 10, between each parts be connected to the direct welding of optical fiber or optical patchcord connects.
Analyze explanation of the present invention characteristic with different luminous power inputs as embodiment below in conjunction with different wavelength numbers.
Embodiment one
As the multi-wavelength super continuum light source that dwdm system is used, require the video stretching of higher each channel of while of conversion efficiency of four wave mixing little.Because of modulating the phase shift that causes from phase modulated and cross-phase, the phase place when pulse is propagated in optical fiber can change.The phase-matching condition of four wave mixing will need the correct parameter of adjusting at the variation of impulse phase in its body is implemented.For making output spectrum wideer, more smooth, just must strict requirement be arranged to the incident light wavelength, the optimal wavelength point under different pumping power can satisfy the phase-matching condition of four wave mixing, thereby produce maximum gain, this gain increases and increases along with incident power.Same this wavelength points is modulated the broadening of the pulse frequency spectrum that causes from phase modulated and cross-phase, finds that the influence that will reduce in four wave mixing from phase modulated and cross-phase modulation paired pulses must reduce pump spectrum luminous power or reduce fiber lengths.In embodiment 1, when the pumping light power of input channel is 100mw, dispersion shifted optical fiber 4 is long to be 10km, and the pump light wavelength is 1555.4nm, when modulating frequency is 10GHz, records the smooth output of the wide spectrum of 40nm at last before demodulation multiplexer.Behind demodulation multiplexer, recording channel spacing is 0.8nm, and channel power is greater than 0.1mW.
Embodiment two
See the spread spectrum of pulse in optical fiber for clearer, observed input pulse respectively 0,5,10 and the frequency spectrum of 15km.Can see the expansion behavior when pulse is influenced by SPM and XPM in optical fiber in experiment significantly, along with the increase of distance, the frequency spectrum of pulse is expanded more, and input power is big more, and the non-linear effects that pulse is subjected to is big more, and spectrum widening is many more.When input power is 50mw, pulse propagation still kept the shape of pulse behind the 15km, and amplitude descends also few, after power improves, though the efficient of four wave mixing has improved, the influence from phase modulated and cross-phase modulation that pulse is subjected to is more, and spread spectrum ground is more.In embodiment 2, when input power reached 200mw, fiber lengths was 5km, and when the pump light wavelength was 1559.1nm, the spectral width that records at output can reach 60nm, and the power of each channel wavelength is about 1mW.
Claims (7)
1, a kind of multi-wavelength super continuum light source of dense wavelength division multiplexing system, comprise: continuous semiconductor laser (1), phase modulator (2), dispersive optical fiber (3), erbium-doped fiber amplifier (4), dispersion shifted optical fiber (5), 90: 10 fiber couplers (6), 50: 50 fiber coupler (7), frequency microwave source (8), erbium-doped fiber amplifier (9) and demodulation multiplexer (10), it is characterized in that, the fiber coupler (7) of 90: 10 fiber couplers (6) and 50: 50 forms ring-like chamber, the continuous light of semiconductor laser (1) output is input to phase modulator (2) through fiber coupler (7) connection, phase modulator (2) is connected with frequency microwave source (8), phase modulator (2) back connects dispersive optical fiber (3), dispersive optical fiber (3) back connects powerful erbium-based amplifier (4), connect dispersion shifted optical fiber (5) thereafter, dispersion shifted optical fiber (5) back connects 90: 10 fiber coupler (6), its 90% delivery outlet is connected with another input port of fiber coupler (7), 10% port of fiber coupler (6) is erbium-doped fiber amplifier (9) in succession, erbium-doped fiber amplifier (9) other end input demodulation multiplexer (10), between each parts be connected to the direct welding of optical fiber or optical patchcord connects.
2, the multi-wavelength super continuum light source of dense wavelength division multiplexing system according to claim 1 is characterized in that, continuous semiconductor laser (1) is the continuous semiconductor laser of tunable or fixed wave length.
3, the multi-wavelength super continuum light source of dense wavelength division multiplexing system according to claim 1 is characterized in that, phase modulator (2) is a lithium niobate electric light phase modulator, perhaps position phase or intensity modulator.
4, the multi-wavelength super continuum light source of dense wavelength division multiplexing system according to claim 1 is characterized in that, dispersive optical fiber (3), dispersion shifted optical fiber (5) are selected length and fiber type according to the output of multi wave length illuminating source.
5, the multi-wavelength super continuum light source of dense wavelength division multiplexing system according to claim 1, it is characterized in that, the splitting ratio of two fiber couplers (6) and (7) is respectively 90: 10 and 50: 50, perhaps splitting ratio is selected in output according to the power of multi wave length illuminating source, wherein fiber coupler (7) or be optical circulator.
6, the multi-wavelength super continuum light source of dense wavelength division multiplexing system according to claim 1 is characterized in that, erbium-doped fiber amplifier (4), (9) or substituted by one or more semiconductor optical amplifiers.
7, the multi-wavelength super continuum light source of dense wavelength division multiplexing system according to claim 1, it is characterized in that, the type of demodulation multiplexer (10) and output wavelength standard, wavelength output according to multi wave length illuminating source is selected, satisfy the demand of dwdm system, wherein adopt the demodulation multiplexer (10) of 50Ghz, 100GHz, then be applicable to the dense wavelength division multiplexing system of 50Ghz or 100Ghz space interval.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418277C (en) * | 2005-05-20 | 2008-09-10 | 南开大学 | Continuous running high-power multi-wavelength optical fiber light source based on ultra continuous spectrum |
| CN1863026B (en) * | 2005-05-12 | 2010-07-14 | 中兴通讯股份有限公司 | WDM terminal apparatus using multi-wavelength laser |
| CN101371192B (en) * | 2006-01-20 | 2012-02-22 | 住友电气工业株式会社 | Light source apparatus |
| CN102447212A (en) * | 2011-12-06 | 2012-05-09 | 中国科学院上海光学精密机械研究所 | Coherent beam combination system for an optical feedback ring cavity of a pulsed fiber amplifier array |
| CN107248689A (en) * | 2017-08-10 | 2017-10-13 | 珠海光恒科技有限公司 | A kind of full multimode pumping double-cladding fiber amplifier of high-power narrow line width |
| CN107917669A (en) * | 2017-11-15 | 2018-04-17 | 苏州润桐专利运营有限公司 | A kind of optical fibre displacement sensor demodulation method |
| CN115579721A (en) * | 2022-11-21 | 2023-01-06 | 中国航天三江集团有限公司 | Multi-wavelength laser generation system and method |
-
2003
- 2003-10-30 CN CNB2003101083037A patent/CN1271757C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1863026B (en) * | 2005-05-12 | 2010-07-14 | 中兴通讯股份有限公司 | WDM terminal apparatus using multi-wavelength laser |
| CN100418277C (en) * | 2005-05-20 | 2008-09-10 | 南开大学 | Continuous running high-power multi-wavelength optical fiber light source based on ultra continuous spectrum |
| CN101371192B (en) * | 2006-01-20 | 2012-02-22 | 住友电气工业株式会社 | Light source apparatus |
| CN102447212A (en) * | 2011-12-06 | 2012-05-09 | 中国科学院上海光学精密机械研究所 | Coherent beam combination system for an optical feedback ring cavity of a pulsed fiber amplifier array |
| CN107248689A (en) * | 2017-08-10 | 2017-10-13 | 珠海光恒科技有限公司 | A kind of full multimode pumping double-cladding fiber amplifier of high-power narrow line width |
| CN107248689B (en) * | 2017-08-10 | 2018-05-25 | 珠海光恒科技有限公司 | A kind of full multimode pumping double-cladding fiber amplifier of high-power narrow line width |
| CN107917669A (en) * | 2017-11-15 | 2018-04-17 | 苏州润桐专利运营有限公司 | A kind of optical fibre displacement sensor demodulation method |
| CN115579721A (en) * | 2022-11-21 | 2023-01-06 | 中国航天三江集团有限公司 | Multi-wavelength laser generation system and method |
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| CN1271757C (en) | 2006-08-23 |
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